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diff --git a/lib/dpkg/db-fsys.h b/lib/dpkg/db-fsys.h
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+/*
+ * libdpkg - Debian packaging suite library routines
+ * db-fsys.h - management of database of files installed on system
+ *
+ * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright © 2008-2014 Guillem Jover <guillem@debian.org>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBDPKG_DB_FSYS_H
+#define LIBDPKG_DB_FSYS_H
+
+#include <dpkg/file.h>
+#include <dpkg/fsys.h>
+
+DPKG_BEGIN_DECLS
+
+/*
+ * Data structure here is as follows:
+ *
+ * For each package we have a ‘struct fsys_namenode_list *’, the head of a list of
+ * files in that package. They are in ‘forwards’ order. Each entry has a
+ * pointer to the ‘struct fsys_namenode’.
+ *
+ * The struct fsys_namenodes are in a hash table, indexed by name.
+ * (This hash table is not visible to callers.)
+ *
+ * Each fsys_namenode has a (possibly empty) list of ‘struct filepackage’,
+ * giving a list of the packages listing that filename.
+ *
+ * When we read files contained info about a particular package we set the
+ * ‘files’ member of the clientdata struct to the appropriate thing. When
+ * not yet set the files pointer is made to point to ‘fileslist_uninited’
+ * (this is available only internally, within filesdb.c - the published
+ * interface is ensure_*_available).
+ */
+
+struct pkginfo;
+
+void ensure_diversions(void);
+
+enum statdb_parse_flags {
+	STATDB_PARSE_NORMAL = 0,
+	STATDB_PARSE_LAX = 1,
+};
+
+uid_t statdb_parse_uid(const char *str);
+gid_t statdb_parse_gid(const char *str);
+mode_t statdb_parse_mode(const char *str);
+void ensure_statoverrides(enum statdb_parse_flags flags);
+
+#define LISTFILE           "list"
+#define HASHFILE           "md5sums"
+
+void ensure_packagefiles_available(struct pkginfo *pkg);
+void ensure_allinstfiles_available(void);
+void ensure_allinstfiles_available_quiet(void);
+void note_must_reread_files_inpackage(struct pkginfo *pkg);
+void parse_filehash(struct pkginfo *pkg, struct pkgbin *pkgbin);
+void write_filelist_except(struct pkginfo *pkg, struct pkgbin *pkgbin,
+                           struct fsys_namenode_list *list, enum fsys_namenode_flags mask);
+void write_filehash_except(struct pkginfo *pkg, struct pkgbin *pkgbin,
+                           struct fsys_namenode_list *list, enum fsys_namenode_flags mask);
+
+DPKG_END_DECLS
+
+#endif /* LIBDPKG_DB_FSYS_H */